ement are designed in to the frame . Modern buildings codes have specifications for the so-called ductile concrete frames . However , at present , these codes often require excessive reinforcement at certain points in the frame so as to cause congestion and result in construction difficulties 。Even so , concrete frame design can be both effective and economical 。Р Of course , it is also possible bine rigid-frame construction with shear-wall systems in one buildings 。For example , the buildings geometry may be such that rigid frames can be used in one direction while shear walls may be used in the other direction。РSummaryРAbove states is the high-rise construction ordinariest structural style. In the design process, should the economy practical choose the reasonable form as far as possible.
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