Static structures (e.g. – buildings) – With component having discrete prestressing means – Slab or panel construction
Reexamination Certificate
1998-08-31
2001-08-07
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
With component having discrete prestressing means
Slab or panel construction
C052S223130, C052S223140, C052SDIG007, C156S071000, C156S161000, C428S299100, C428S299400, C428S299700
Reexamination Certificate
active
06269599
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
Construction Component or Construction with a Composite Structure, Associated Composite Construction Element, and Manufacturing Method The invention relates to a construction component or construction which at least exhibits at least one composite structure with several bearing fibers arranged essentially parallel to each other, and a binder component, in which the bearing fibers are embedded, the fibers being connected to one another so as to be shear-resistant. A corresponding composite construction element and a manufacturing method also pertain to the subject matter of the invention.
2. Description of Background and Relevant Information
Composite structures of the named type are often used in different areas of technology, especially, for example, in the repair or the subsequent reinforcement of construction components or constructions which originally were produced without an additional composite construction element, especially in those with a reinforced-concrete foundation. In this context, a setting or adaptation of the elasticity characteristics and the solidity values is often desired or essential, especially in consideration of the characteristics of constructions and connection elements working in conjunction with the composite construction element. The fibers considered for this, especially glass and carbon fibers, and, if appropriate, boron fibers or fibers of high-strength polymer synthetic materials, by way of example, are available in a large range of various modulus values, but generally only with large gaps in the value range and in combination with other material parameters, especially tensile fracture resistance. In practice, this results in a severe limitation of selection and adaptation opportunities.
A related problem area concerns the distribution of stress under load in a construction component or construction with different composite structures, especially in a bond between a concrete foundation that, for its part, contains steel reinforcement and therewith its own composite structure, and a fibrous composite construction component connected to this foundation via material-to-material bonding or a form fit. In this respect, too, there is a practical need for advancement.
SUMMARY OF THE INVENTION
The task of the invention is therefore first to create a construction method for construction components, constructions, or composite construction components, and an embodiment of a manufacturing method, of which a setting and an adaptation of the elasticity and solidity characteristics can be facilitated and improved, especially with respect to an extensive and uniform utilization of the bearing fibers.
The solution to this task in accordance with the invention is determined with respect to a construction component or construction or composite construction component by the features of described herein. Regarding the manufacturing method, the solution to the task in accordance with the invention is determined by the features also described herein. Essential refinements and embodiments of the invention are determined by the features which are also described herein.
The features of the invention as defined herein, whether alone or in combination, enable a largely gap-free setting range for the elasticity and solidity characteristics, and for the tension distribution in the construction component or the construction or in the composite construction component. Moreover, the invention helps pave the way toward an optimization of utilization, and of the bearing and deformation behavior of construction components, constructions, or composite construction elements. In particular, moreover, the deformation behavior in stress states near breaking point can be influenced and improved in a controlled and targeted manner.
The features of the invention enable a largely gap-free setting range for the adaptation between the elasticity characteristics of the composite-relevant sections of the foundation, on the one hand, and on the other, of the composite construction component. This is expressed in an overall elasticity modulus to be defined for both sides, that is, in a mean value which, for the foundation, results in accordance with conventional analytical procedures from the respective foundation cross-section, and for the composite construction component, from the sum of the elasticity moduli of the different fiber components, weighted with their fiber cross-section portion. The noted cross-section portions are thereby parameters that can be constantly selected, in terms of construction or manufacturing, with known methods. In order to attain a sufficiently essentially homogenous, or not excessively inhomogeneous, overall cross-section composition, the fibers of the fiber components in the cross-section of the composite structure are to be mutually interspersed, at least in sections. For the same reason, and with respect to the avoidance of a prohibitively low or non-uniform utilization of cross-section portions, the component/cross-section portion ratio is to be limited against certain extreme values. In one embodiment, this delimitation is expressed in the limiting values of the cross-section portion of the fiber components having respectively more or the most tensile strength. In the process of optimizing homogeneity or cross-section utilization, in a refining variant of the invention, minimum values of 18%, and preferably 25%, result in a further development of the invention for the cross-section portions of the fiber component having respectively more or the most tensile strength.
In defining the term “cross-section portion,” it is noted that this term is to be understood in the present context as a proportional variable referring to an overall cross-section surface.
Generally, this proportional variable can relate to both an overall fiber cross-section surface of several or all fiber components and an overall cross-section surface of the composite construction element, or a surface within the same. Also figured into the latter definition of the overall cross-section surface are partial surfaces that are irrelevant or can be disregarded with respect to the tensile elasticity of the composite construction element, e.g., the partial surface which is associated with the binder component and which in any case is not decisive for the fiber components. The first definition, however, only involves dimensional variables of the fiber components themselves.
After the overall elasticity modulus as described above results in E
0
=A
1
.E
1
+A
2
.E
2
for the example of two fiber components FK
1
, FK
2
with the cross-section portions A
1
, A
2
and the moduli E
1
and E
2
, in the first case, E
0
is a characteristic elasticity value for the combination of the fiber components deformed together; in the second case, by contrast, E
0
is a characteristic elasticity value for the composite construction component with its respective overall cross-section structure. In both cases, fundamentally-different numerical values result for E
0
: In the second case, a lower numerical value generally results. This is to be taken into consideration for the use of E
0
for evaluating-type calculations, such as for determining deformation under stress. In the first case—insofar as no other components relevant to elasticity are present—only the actual cross-section surfaces of the fiber components are taken into account; in the second case, the cross-section surface of the composite construction component as dictated by constructive guidelines is considered. The latter actually can be desired in practice, but can result in unwieldy characteristics, e.g., when cross-section portions which are irrelevant in terms of elasticity technology, and thus the overall cross-section surface, vary with constant fiber-component cross-sections along the composite construction element.
A refinement fundamental to the invention provides a composite construction element which is connected by way of material-to-material bonding, and thereby in shear-
Friedman Carl D.
Greenblum & Bernstein P.L.C.
Wilkens Kevin D.
LandOfFree
Construction component or construction with a composite... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Construction component or construction with a composite..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Construction component or construction with a composite... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2456819